A fixing structure 40 has an inwardly-facing seat 22, a front side seat 42, and fixing members 44. The inwardly-facing seat 22 is fixed to a floor portion 14 such that passengers PA face in a vehicle transverse direction. The front side seat 42 has a seat cushion 46 on which the passenger PA sits, and a supporting member 52, and is disposed at the floor portion 14 at a vehicle longitudinal direction front side of the inwardly-facing seat 22, and rear wheels 36 can contact the seat cushion 46 in a vehicle longitudinal direction. The supporting member 52 supports the seat cushion 46 such that the seat cushion 46 can rotate toward the inwardly-facing seat 22. The fixing members 44 fix a wheelchair 30 to the floor portion 14 in a state in which the rear wheels 36 are made to contact the front side seat 42.
